What is the lens formula derivation?

Consider a convex lens with an optical center O. Let F be the principle focus and f be the focal length. An object AB is held perpendicular to the principal axis at a distance beyond the focal length of the lens. The above equation is known as the Lens formula. …

What is the correct formula of lens?

What is the Lens Formula? Answer: According to the convex lens equation, the lens formula is 1/f = 1/v + 1/u. It relates the focal length of a lens with the distance of an object which is placed in front of it and the image formed of that object.

What is deviation in lens?

Let a ray of monochromatic light parallel to the principal axis be incident on a thin lens at a height h above the axis and let f be the focal length of the lens. As the ray is parallel to the principal axis, after refraction it will pass through the second focus.

What is a best form lens?

A best form spectacle lens is a lens designed to minimise the effects of oblique astigmatism and therefore provide the best possible vision in oblique gaze. Secondary considerations are distortion and transverse chromatic aberration.

Which is the best form of the thin lens equation?

Thin Lens Equation A common Gaussian form of the lens equation is shown below. This is the form used in most introductory textbooks. A form using the Cartesian sign conventionis often used in more advanced texts because of advantages with multiple-lens systems and more complex optical instruments.

Which is the best form for lens design?

By becoming familiar with the essential lens design forms, we can use them to our advantage during lens design. The examples in this Guide provide a birds-eye view of the various lens design forms and why certain lens combinations are used, to help visualize typical lens designs and even complex lens designs.

How to find the formula for the lens?

1) (from similar ΔPOF and ΔFB’A’) (from figure PO = AB) (equ. 2) (from equ. 1 and equ. 2) (substituting optical distance values) (dividing by u,v and f on both the sides) Therefore, this is known as Lens formula. This was the derivation of Lens formula. Stay tuned with BYJU’S and learn various other Physics related topics.

How are extrafocal distances used in the lens equation?

In the Newtonian form of the lens equation, the distances from the focal length points to the object and image are used rather than the distances from the lens. Newton used the “extrafocal distances” xoand xiin his formulation of the thin lens equation. It is an equivalent treatment, but the Gaussian form will be used in this resource.